Patrick Lyoya: Could rethink of US police traffic stops save lives?

The fatal shooting of a young black man in Michigan after a scuffle during a traffic stop has once again raised questions about the police use of lethal force - and why pulling over African American motorists so often leads to tragedy.

In a quiet suburb of the Michigan city of Grand Rapids, a collection of flowers, cards and candles has been placed against a tree next to a small front lawn.

This corner of Nelson Avenue and Griggs Street - the intersection of two parallel rows of neat clapboard...